Vulnerability

Ult benefits from Vulnerability. Insane damage.

R procs Vulnerability.

Vulnerability + Shadowflame creates an 8x multiplicative damage amp with Prismatic.

Katarina's ult counts as a high-frequency channeled DPS ability and triggers on-hit. Pair with Kraken Slayer, Bloodthirster/Bork, and Jeweled Gauntlet + Vulnerable for the highest single-second DPS in the game. Every dagger thrown during her spin triggers a 7.17x damage multiplier.

Once you grab Vulnerable, use it so item DoTs (Liandry's, Rylai's, etc.) and abilities crit. Add Jeweled Gauntlet's 45% crit chance for 70% total — DoTs become real damage. Shadowflame doubles up the crit. Once Vulnerable lands, go double-DoT: Shadowflame + Vulnerable doubles up crit damage on abilities.

Forge: max crit damage to cap.

Rumble's Q and R are extremely high-frequency DoTs. With Jeweled Gauntlet + Vulnerable + Infinity Edge + Shadowflame, each burn tick gets amplified 7.17x — annihilates even tanks. As an AP champion, Jeweled Gauntlet's AP-to-crit ratio is excellent — late, you hit full crit without crit items.

Q's multi-hits all benefit from Vulnerable's amp — damage is absurd.

Q1 has a bleed — Ethereal Weapon procs the whole bleed window. Wolf pack charges in and one-shots.

Corki's E and W are high-frequency DoTs. After crit-damage changes, DoTs proc both Jeweled Gauntlet and Vulnerable — multiplicative amps. As a mixed-damage champ, Shadowflame and triple-amp logic fit perfectly. W's gattling fire trail and E reliably amplify crit damage.

Invincible. Charge in invuln.

Mandatory: Vulnerable + Executioner. With Bork, jump anyone — they die; no front-line concept, squishies vaporized. Hexes must have Vulnerable + Executioner; flex rest. Back to Basics and Clown College are huge prismatic upgrades; gold Upgrade Infinity Edge / Vampirism / Transmute Chaos / Soul Siphon all great; silver Adapt / Upgrade Collector / Big Hits / Brute Force / Bloodlust are also solid. Items: Hubris start, then Bork, then Death's Dance, pick from Liandry's / Black Cleaver / Eclipse / Bloodthirster.

Activate Mythic Flame bond + 3 burn items = happy launch.

W and E benefit from Vulnerability.

Tank champs with Vulnerable make Sunfire, Unending Despair, Thornmail, and Heartsteel item damage crit. Build Atma's for 50% crit and turn all your tank items into damage.